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3489632
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Patent number 3,489,632
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Issue date Jan 13, 1970
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B31 - MAKING ARTICLES OF PAPER OR CARDBOARD WORKING PAPER OR CARDBOARD
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3450856
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Patent number 3,450,856
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Issue date Jun 17, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3188257
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Patent number 3,188,257
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Issue date Jun 8, 1965
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B31 - MAKING ARTICLES OF PAPER OR CARDBOARD WORKING PAPER OR CARDBOARD
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2681296
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Patent number 2,681,296
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Issue date Jun 15, 1954
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2662967
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Patent number 2,662,967
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Issue date Dec 15, 1953
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL